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Goryan [66]
3 years ago
10

HELLPP!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics
1 answer:
Genrish500 [490]3 years ago
6 0

\left\{\begin{array}{ccc}2x-3y=-27&|\cdot3\\-3x+2y=23&|\cdot2\end{array}\right\\\underline{\left\{\begin{array}{ccc}6x-9y=-81\\-6x+4y=46\end{array}\right}\ \ \ \ |\text{add both sides}\\.\ \ \ \ \ \ -5y=-35\ \ \ \ \ |:(-5)\\.\ \ \ \ \ \ \ \ y=7\\\\\text{put the value of y to the first equation}\\\\2x-3(7)=-27\\\\2x-21=-27\ \ \ \ |+21\\\\2x=-6\ \ \ \ |:2\\\\x=-3\\\\\text{Answer:}\ x=-3,\ y=7\to\boxed{(-3,\ 7)}

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vovikov84 [41]
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2 years ago
1. Kalena was asked to prove ifx(x - 1)(x + 1) = x3 - X represents a polynomial identity. She
Verdich [7]

Answer:

C. Kalena made a mistake in Step 3. The justification should state: -x²

+ x²

Step-by-step explanation:

Given the function x(x - 1)(x + 1) = x3 - X

To justify kelena proof

We will need to show if the two equations are equal.

Starting from the RHS with function x³-x

First we will factor out the common factor which is 'x' to have;

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Factorising x²-1 using the difference of two square will give;

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Note that for two real number a and b, the expansion of a²-b² using difference vof two square will give;

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Factorising x²-1 using the difference of two square will give;

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Factorising x(x+1) gives x²+x, therefore

x(x+1)(x-1) = (x²+x)(x-1)

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6 0
3 years ago
Which of the following represents 32=8 x 4
cricket20 [7]
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4 0
3 years ago
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3 years ago
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babunello [35]

Answer:

3

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The largest number they both share is 3, so that is the GCF

4 0
3 years ago
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